Conveners
DM III
- Ian Lewis (The University of Kansas)
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Yash Aggarwal10/05/2022, 14:00
If dark matter annihilates into high-energy Standard Model particles, the remnants of these final states can be discovered, for example by GeV-scale secondary photons from the galactic center. It is much more difficult to discover a scenario where dark matter annihilates into very low- energy photons. This may occur in the case where the annihilation produces a cascade of hidden- sector states...
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Daneng Yang (Department of Physics, University of California, Riverside)10/05/2022, 14:15
Dark matter halos, produced during cosmic structure formation, organize themselves under gravity in an expanding background. We show that some novel features of their distributions can be understood in the framework of network theory by using a preferential attachment mechanism. For the subhalos sitting inside their least massive hosts, we create links based on their spatial extensions and...
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Brooks Thomas10/05/2022, 14:30
In scenarios in which multiple production channels contribute the overall dark-matter abundance, the primordial dark-matter velocity distribution can exhibit a highly non-trivial shape involving multiple, well-separated peaks and can receive significant support across a broad range of scales. The effect of free-streaming in such scenarios can give rise to patterns of cosmic structure which...
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Erwin Tanin (Johns Hopkins University)10/05/2022, 14:45
We study the solar emission of light dark sector particles that self-interact strongly enough to self-thermalize. The resulting dark fluid accelerates under its own thermal pressure and attains highly relativistic bulk velocities in the solar system. Compared to the ordinary free-streaming scenario, the local dark outflow has a much higher number density and correspondingly a much lower...
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Dr Patrick Stengel (SISSA)10/05/2022, 15:00
Any dark matter spikes surrounding black holes in our Galaxy are sites of significant dark matter annihilation, leading to a potentially detectable neutrino signal. In this paper we examine $10-10^5 M_\odot$ black holes associated with dark matter spikes that formed in early minihalos and still exist in our Milky Way Galaxy today, in light of neutrino data from the ANTARES and IceCube...
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Yujin Park10/05/2022, 15:15
I describe a reanalysis of data sets that have previously been found to harbor evidence for an unidentified X-ray line at 3.5 keV in order to quantify the robustness of earlier results that found significant evidence for a new X-ray line at this energy. The 3.5 keV line is intriguing in part because of possible connections to dark matter. We analyze observations from the XMM-Newton and Chandra...
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Subhajit Ghosh (University of Notre Dame)10/05/2022, 15:30
Dark radiation (DR) appears as a new physics candidate in various scenarios beyond the Standard Model. While it is often assumed that perturbations in DR are adiabatic, they can easily have an isocurvature component if more than one field was present during inflation, and whose decay products did not all thermalize with each other. In this talk, I will discuss the constraints on both...
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Ms Wenzer Qin (MIT)10/05/2022, 15:45
Dark matter interactions with Standard Model particles can inject energy at early times, altering the standard evolution of the early universe. In particular, this energy injection can perturb the spectrum of the cosmic microwave background (CMB) away from that of a perfect blackbody. For this study, I will discuss recent work to update the DarkHistory code package to more carefully track...
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